I. To determine the lowest dose of erlotinib (erlotinib hydrochloride) that will decrease the ratio of phosphorylated to total epidermal growth factor receptor (EGFR) (phosphorylated EGFR [pEGFR]/EGFR) by at least 20% in subjects with premalignant lesions of the lung. This will be accomplished by implementing a dose de-escalation trial of erlotinib (i.e., 75, 50, and 25 or 100 mg by mouth daily for a 3-month period), and determining the pEGFR/EGFR ratio in premalignant lesions of the lung epithelium by immunohistochemistry. Changes in the pEGFR/EGFR ratio will be assessed by comparing the pre-treatment (baseline) ratio to that of the post-treatment (3 month) ratio, measured in paraffin embedded biopsy specimens.